DDS Signal Generator Module Development Board (AD9850 / AD9851) Key benefits and why you need it Precise frequency generation: Provides accurate, stable sine and square waves for testing, development, and signalsource applications. Flexible signal control: Two independent sine outputs and two square outputs let you feed multiple circuits or compare signals without extra equipment. Cleaner signals at moderate frequencies: Builtin 70 MHz lowpass filter reduces frequency spurs and improves signaltonoise ratio, making outputs more usable for measurement and prototyping. Adjustable amplitude and duty cycle: Amplitude can be tuned via a dedicated pin; squarewave duty cycle is set by a variable resistor driving the comparator reference, allowing tailored pulse shaping. Core functions and performance Outputs: 2 sine wave outputs and 2 square wave outputs. Frequency range (sine): AD9850: 0–40 MHz; AD9851: 0–70 MHz. Note: harmonics increase and waveform cleanliness decreases above 20–30 MHz. Squarewave output: Available up to 1 MHz. Signal conditioning: Equipped with a 70 MHz lowpass filter to improve SNR and reduce unwanted frequency components. Amplitude control: A pin is provided for convenient amplitude adjustment of the output waveform. Dutycycle control: Comparator reference voltage is set by a variable resistor, enabling different squarewave duty cycles. Oscillator stability: AD9850 module uses a 125 MHz active oscillator; AD9851 module uses a 30 MHz active oscillator for stable, reliable operation. Compatibility and form factor Designed as a developmentboard module compatible with AD9850 and AD9851 DDS chips and standard prototyping workflows. Compact PCB module suitable for bench integration, experiment rigs, and prototype builds. Refer to the product listing for exact dimensions and connector pinouts. Practical applications Signal source for amplifier, filter, and receiver testing: Generate controlled tones to characterize frequency response, gain, and linearity. Function generator for labs and education: Use as a compact, lowcost signal generator for teaching electronics, lab exercises, and student projects. Clock or test stimulus for mixedsignal designs: Provide reference tones or test signals (sine or square) when validating ADCs, DACs, or digital timing circuits. What makes this module stand out Dual sine and square outputs for simultaneous use without extra devices. Builtin lowpass filtering for improved waveform quality up to the specified range. Useradjustable amplitude and duty cycle for flexible signal conditioning. Choice of AD9850 or AD9851 module options to match required frequency range and oscillator characteristics. Notes and limitations At higher frequencies (above 20–30 MHz) harmonics and spurious content increase and waveform purity decreases; use filtering or lower frequency settings for cleaner signals. Squarewave quality is limited above 1 MHz. Check connector pinout and power requirements in the product documentation before integration.